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Dave
Yes I did hog out with 80 using chordal stroke up until the last 1/2 hour. Your hyperbola idea sounds like it could be it. Yes, I'm aiming for F/13. I tried measuring the RoC by wetting the mirror and using the reflection of a torch but from 7 metres away it was too hard to aim. I attempted the sun test but the suns reflection was high out of reach so I was hoping to use it once the reflection was at a reasonable height. It's been cloudy all day every day for the last week and it doesn't look like changing any time soon.
Ralph
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